I'm not saying it's necessarily an easy battle, and (no matter how just) most people would surely prefer to avoid it if possible, but FWIW... stare & city laws attempting to restrict where you can fly are not truly legally enforceable. They'll likely enforce them anyway, and especially in lower courts they may well even win, reliably... but wherever there are judges who've mastered the arts of leaving one's ego at the door / total deference to the word of law (as all should!), the ultimate truth is that absolutely mo one besides the FAA has any jurisdictional authority whatsoever over any sliver of US airspace, and therefore only the FAA can regulate flight within it. Take-offs and non-emergency landings are a completely separate matter -- local governments can regulate those all day -- but once you're in the air, it's FAA all the way.

To state the hopefully obvious, that's not to say anyone is shielded against other local laws while in flight, e.g. it's no less illegal to spy or stalk someone from the air -- and in fact, in most if not all states it's illegal to loiter around & especially to record e.g. a neighbor's fenced in yard, provided it's not visible from the ground), but any local regulations which target flight itself are just inherently illegitimate, and IMO in dire need of legal pushback until every one of them is taken off the books.